William l



(No Model.)

W. L. DENIO.

MAGNETO GENERATOR FOR FIRE ALARM CIRCUITS. No. 394,839.

Patented Dec. 18, 1888.

1722/ auto 7'. Wm

y 7723 flom eyl UNITED STATES PATENT QEETcE.

\VILLIAM Ii. DEi IO, OF ROCHES"ER, NE\\ YORK, ASSIGNOR OF T\\' O-TI'IIRDS TO DANIEL l3. PRATT AND HERBERT ll. )I'SIINELL, 0F SAME PLACE.

MAGNETO-GENERATOR FOR FIRE-ALARM CIRCUETS.

SPECIFICATION forming part of Letters Patent No. 894,889, dated December 18, 1888.

Application filed July 18, 1888. Serial No. 279,808. (No model.)

To aZZ whom it may concern.-

Be it known that 1, WILLIAM L. DENIO, of

Rochester, in the county of Monroe and State I of New York, have invented certain new and useful Improvements in Magneto-Generators for Fire-Alarm Circuits; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the figures and letters of reference marked thereon.

My present invention has for its object to provide an improved apparatus for use in connection with a fire-alarm or in any position to indicate an abnormal increase in the temperature, and more particularly to dispense with the use of a charged main line and the batteries usually employed in such connections, thus decreasing the liability of a false signal being sent by the running down of the battery of a closed circuit or the failure to send a signal from the same cause if an open circuit is employed; and to this end it consists in providing instead of a battery a inagneto-generator of novel construction so arranged and constructed that a current is generated and flows over the line upon the release of the motor operating the generator, and when said generator is inoperative the main line is closed and shunted around the generatorarmature, materially decreasing the resistance of the circuit; and it further consists of certain novelties of construction and combination of parts, all as will hereinafter be fully described and claimed.

In the drawings, Figure l a perspective view of a generatorconstructed in accordance with my invention; Fig. 2 a top plan view of the same, and Fig. 3 a vertical section.

Similar letters of reference in the several figures indicate similar points.

A represents asuitable basc, upon which the generator is mounted, B representing the fieldmagnets and C the pole-pieces connected to the ends of said magnets, as ordinarily. EX- tending between these pole-pieces and connecting them are plates D D, having bearings formed on them, in which th ends of the armature-shaft are jonrnaled.

The armature E is constructed of the wellknown Siemens type, having preferably two coils, E, thereon connected in series, the forward end being extended, as shown at E to form one end of the shaft, the other end being formed by a rod, E, preferably of hard rubber or similar non-comlucting material, passing through the rear bearing in plate D.

In the plate I), in which the extension is journaled, is placed a bushing of hard rubber or similar material, in which said. extension runs. lily thus providing rubber or similar non-oxidizable bearin the perfect operation of it at all times will be insured, and there will be no liability of its stickingby reason of oxidization or from other causes, but its free operation is at all times insured. Further, a bearing is provided needing little or no lubrication; hence the liability of sticking by reason of gummed oil is obviated.

G represents a spring, one end being preferably secured to one of the pole-pieces or connecting-plates and the other to the armature or the forward extension of its shaft, operating, when wound up and released, to turn the armature a few times, the number of course depending upon the amount of the compression of the spring. This spring also preferably forms an electrical connection between the arlnature and the magnets; but it may, if desired, be insulated from one or both and the connection formed in another way.

The forward end of extension E' 'is provided with an arm, c, extending from its periphery and preferably projecting near the base of the instrument arranged to co-operate with a small lever, ll, pivoted at 72 upon the base, and so arranged that when turned in one direction on its pivot one of its arms preferably the shorter one-will engage the end of arm e and prevent the armature rotating, the other arm being preferably slotted at 2', as shown. Mounted upon the base and preferably in proximity to the longer arm of lever H is an extension, I, provided at its outer end with a slot,j, corresponding to that in lever H, and in the slots 1' and j, and extending between these arms, is adapted to be placed a connectingdink, J, preferably constructed in two parts with the ends bent over, as shown, to engage the outer sides of the slotted portions and prevent their separation. The parts of the link are connected by solder, 7f, fusible at a comparatively low degree of heat say, 150 F:-ihrenheitbut, if desired,

ICO

the link could be made of this material, cast or formed with lugs on the ends corresponding to the bent-over portions. It will be seen that upon the separation of the two parts of the link the lever H can be turned on its pivot out of the path of the arm 6, permitting the free rotation of the armature-shaft. I

One terminal of the coils of the armature is preferably connected to the metal of the armature-core or the spring; but the other is connected with the lateral extension on of the rod Z, extending through the rod E in the armature, where it makes contact with a contact, 02, carried upon a spring-finger, M, secured to the base, as shown. This linger presses toward the rod E and the point 01 is preferably composed of carbon or similar nonoxidizable material, so that a good contact will always be maintained between them.

The electrical connections are fully shown in the plan view.

N N represent binding-posts mounted on the base, with which the line-wires of the circuit are connected. From the post N a con- 2 5 ductor, 2, extends directly to the field-magnet pole-pieces, while from the post N a conductor, 5, extends to the post J on the base, and another, 3, extends to and is connected with the spring-finger M.

lVhen the apparatus is in position for operation, the armature-spring is wound up and under tension, the arm E is engaged by one end of the lever H, and its other arm is connected with the post I by the link J. In this position there are two complete circuits passing through the instrument, one starting at post N, extendin to the pole-pieces of the-magnet, through the spring G to the armature-body, through the armaturecoils, rods Z and 'm, con- 40 tact 02, spring M, and wire 3 to post N, and this circuit by reason of the fine wire of the armature is of high resistance. The other circuit starts at post N, passes to magnet pole-piece to armature-body, extension E arm e,lever H, link J, post I, and wire 5 to post N, thence to line. In practice a number of these devices are arranged upon a circuit containing an alarm apparatus of any preferred construction adapted to be operated by a slight current, such as a mechanically-open ated bell controlled by an electro-magnet, and are located at the various points where an unusual rise in temperature caused by a fire is liable to occur, as in mills or other places where thermostats are usually placed.

Upon the breaking out of a fire near one of the devices or an unusual rise in temperature from other causes the solder on the link J will be melted and the sections separated by the force of spring G, acting through the armature-shaft, arm 6, and lever II, allowing the armature to rotate rapidly for a few turns. This will sever the circuit through the link and the rapid rotation of the armature will generate a current therein, which will pass out over the line through the circuit embodying the fusible joints of the other instruments and operate the alarm apparatus wherever it may be. The path traversed by the current from the generator, it will be noted, is of comparatively low resistance, passing through the fusible joint-circuit and not through the coils of the armature of each instrument, so that even should the fusible joint-circuit of one or two of the instruments be broken by accident or by reason of a fire any other in the circuit could operate the alarm apparatus.

The herein-described instrument could be applied to many uses, such as operating a valve operating mechanism for d ry-pipe fire-extinguishingsystems or similar purposes.

Of course the fusible link could be connected directly with the arm on the armature, if desired, instead of through the lever; but Iprefer the arrangement shown, as there is not so much st *ain upon it; consequently it is not so liable to be accidentally broken.

Various modifications will at once suggest themselves to those skilled in the art, and I therefore do not desire to be con fined to the precise details shown.

I claim as my invention 1. The combination, with a magneto-gener ator embodying a field-magnet and an armature adapted to be rotated, of a motor for rotating said armature, a stop for holding it in check, and a joint embodying a readily-fusible material for holding said stop in position, substantially as described.

2. The combination, with a magneto-generator embodying a field-magnet and an armature adapted to be rotated, of a spring-motor for rotating said armature, a stop for holding it in check, and a joint embodying readilyfusible material for retaining said stop inpositiou, substantially as described.

The combination, with a magneto-generator embodying a field-magnet and an armature adapted to be rotated, of a motor for rotating said armature, a lever co-operating with the armature to hold it in check, and a link embodying rezulily-fusible material for holding the lever in engagement, substantially as described.

a. The combination, with a magneto-generator embodying a field-magnet and an armature adapted to be rotated, of a motor for to tating said armature, a stop engaging the armature, a joint embodying readily-fusible material for holding the stop in engagement, a circuit embodying the armature-coils, and a circuit embodying the fusible connection, substantially as described.

5. The combination, with a magneto-generator embodying a field-magnet and an armature adapted to be rotated, of a motor for rotating said armature, a stop engaging said armature, a joint embodying readily-fusible ma terial for holding the stop in engagement, electrical connections between the terminals of the coils and through the fusible joint, substantially as described.

6. The combination, with a magneto-generator embodying a field-magnet and an armature adapted to be rotated, of a motor for rotating said armature, a stop engaging said armature, ajoint embodying readily-fusible material for holding the stop in engagement, one terminal of the coils connected to the armature, and electrical connections from the other terminal through the fusible joint, stop, and armature, substantially as described.

7. The combination, with a magneto-generator embodying a field-magnet and an armature, of a motor for rotating said armature, a projection on the armature, a lever engaging said projection having a slot therein, a projection having a corresponding slot, and a link adapted to connect them embodying readily-fusible material, substantially as described.

The combination, with a 111agneto-generator embodying a field-magnet, a movable ar-- mature, and a motor to r operating it, of a readily-fusible connection for preventing said armature from moving until melted, and then allowing the motor to move it and generate a current, substantially as described.

9. The combination, with a magneto-generator embodying a field-magnet, a movable armature, and a motor for operating it, of a readily-fusible connection for preventing said armature from moving until melted, and then allowing the motor to move it and generate a current, a circuit embodying the coils of the generator, and a shuntcontrolled by the t'nsible connection, substantially as described.

\VM. L. DENIO.

\V itnesses:

FRED 1 CHUReH, H. L. BUSHNELL. 

